import type { KnowledgePiecePreparedJson } from '../../pipeline/PipelineJson/KnowledgePieceJson';
/**
 * @param knowledgePieces
 * @returns
 *
 * @private internal utility of `createPipelineExecutor`
 */
export declare function knowledgePiecesToString(knowledgePieces: ReadonlyArray<Pick<KnowledgePiecePreparedJson, 'content'>>): string;